Convert MIDI permission requests to use WebContents in preparation for switching the code to using …

content/browser/media/midi_dispatcher_host.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_
+#define CONTENT_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_
+
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/memory/weak_ptr.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace content {
+
+class BrowserContext;
+
+// MidiDispatcherHost handles permissions for using system exclusive messages.
+class MidiDispatcherHost : public WebContentsObserver {
+ public:
+  explicit MidiDispatcherHost(WebContents* web_contents);
+  virtual ~MidiDispatcherHost();
+
+  // WebContentsObserver implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+ private:
+  void OnRequestSysExPermission(int bridge_id,
+                                const GURL& origin,
+                                bool user_gesture);
+  void OnCancelSysExPermissionRequest(int bridge_id,
+                                      const GURL& requesting_frame);
+  void WasSysExPermissionGranted(int render_process_id,
+                                 int render_view_id,
+                                 int bridge_id,
+                                 bool is_allowed);
+
+  struct PendingPermission {
+    PendingPermission(int render_process_id,
+                      int render_view_id,
+                      int bridge_id);
+    ~PendingPermission();
+    int render_process_id;
+    int render_view_id;
+    int bridge_id;
+    base::Closure cancel;
+  };
+  std::vector<PendingPermission> pending_permissions_;
+
+  base::WeakPtrFactory<MidiDispatcherHost> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MidiDispatcherHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_MEDIA_MIDI_DISPATCHER_HOST_H_